SKM 2021 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 5: Poster Session: Superconductivity
TT 5.7: Poster
Montag, 27. September 2021, 13:30–16:00, P
125Te NMR studies of 1T-MoTe2 under pressure -Towards superconductivity mediated by Weyl Fermions — •Takuto Fujii1, Hiroshi Yasuoka1, M.O. Ajeesh1, Marcus Schmidt1, Takeshi Mito2, Michael Nicklas1, Claudia Felser1, Andrew Mackenzie1, and Michael Baenitz1 — 1MPI for Chemical Physics of Solids, D-01187 Dresden, Germany — 2School of Science, University of Hyogo Hyogo, Japan
1T-MoTe2 is claimed to be one of the type-II Weyl semimetals, and has attracted much attention due to its exotic physical properties stemming from the topological (line nodal) band structure where the electron and hole pockets are touching at the EF. One of the most preeminent features is the occurrence of superconductivity which is stabilized under pressure up to around Tc=7K. In order to understand the superconductivity, we have employed the 125Te NMR technique under pressure (up to 2.17 GPa) and measured the NMR line profile and T1, determining the Knight shift and low lying magnetic excitations. Using the same NMR tuning circuit, we have also measured the pressure and temperature (T) dependences of the resonant frequency, and extracted the T-dependence of the Hc2. The results are not in accord with simple WHH model, but are well fit to an empilical formula, Hc2(T)= Hc2(0)[1−T/Tc]α. By doing this, we obtained Hc2(0)=1.50T, Tc= 3.81K, and α=1.1 at 2.17 GPa. A superconducting signature has been observed in K(T) and 1/T1T(T) at around 2.5 K (2.17GPa). We present detailed NMR results and try to explore the superconductivity from the microscopic point of view.